Device for manufacturing tubular products

ABSTRACT

A device for manufacturing tubular products from wooden battens by winding the battens on a rotating core with the aid of an endless driving band which presses the batten against the core, and a system of circular elements for ensuring continuous feed and compaction of the battens.

United States Patent 1 Abramov et al. [4 1 Jan. 9, 1973 [54] DEVICE FORMANUFACTURING [51] Int. Cl. ..B27h 5/00 TUBULAR PRODUCTS [58] Field ofSearch ..l44/268 [75] inventors: Viktor Petrovich Abramov; Yan

Petrovich Junga; Gunard Val- [56] References Cited demarovich Berzin;Voldemar UNITED STATES PATENTS Petrovich Skrupsky, all of Riga; PetrNikoleavich Frolov, Moscow; Andrei 77,036 4/1868 Hale ..l44/268Lukyanovich Lugovskoi; Felix, Alex- 341,866 5/1886 Ang'm 2,392,1941/1946 Seymour ..l44/268 Assignee:

US. Cl

androvich Shilgorin, both of Odessa; Yan Yanovich Dalbinsh, Riga; KarlArturovich Rotsen, Riga; Andris Eduardovich Ziemelis, Riga; ArturElksnis, Riga; Bruno et al. Priede, Jurmala, all of U.S.S.R.

Institut Khimii Drevesiny Akademii Nauk Latviiskoi SSR, Riga, U.S.S.R.

Oct. 9, 1970 Primary Examiner--Donald R. Schran Attorney-Holman & Stern[57] ABSTRACT A device for manufacturing tubular products from woodenbattens by winding the battens on a rotating core with the aid of anendless driving band which presses the batten against the core, and asystem of circular elements for ensuring continuous feed and compactionof the battens. 4

1 Claim, 3 Drawing Figures DEVICE FOR MANUFACTURING TUBULAR PRODUCTSBACKGROUND OF THE INVENTION The present invention relates to themanufacture of products from plasticized wood and more specifically todevices for manufacturing tubular products from wooden battens.

Widely known in the art is the method of manufacturing tubular productsfrom plasticized wooden battens by winding battens on a rotating coreclamped in a turning lathe or some other machine specially adapted forthe purpose. The batten is wound on the core with the aid of a metalbank, one end of which is secured to the core. The batten is insertedbetween with the core and the band. The free ends of the batten and theband being inserted into a carriage which moves the components along thecore and tensions the band and the batten which is required forcompacting the batten.

These devices have a low output since they operate on an intermittentprinciple and require stopping the device each time after winding onebatten and before inserting the next batten.

An object of the invention is to eliminate the disadvantages of theknown devices.

The main object of the invention consists in providing a device ensuringa continuous feed of the battens onto the core.

SUMMARY OF THE INVENTION This object is accomplished by providing adevice for manufacturing tubular products from wooden battens by windingthe battens on a rotating core with the aid of a band pressing thebatten against the core in which, according to the invention, the bandis of an endless driving type moving in synchronism with rotation of thecore and installed so that it fits around the core and in which there isa system consisting of at least two circular elements embracing the coreone after another, with the first circular element relative to thestart-of-winding point being set stationary with respect to the core andhaving a helical rear face surface serving as a guide for the battenbeing wound on the core while the second or last circular element isinstalled so as to be able to rotate in synchronism with the core andthe band, and being provided with an internal tapered surface whichnarrows towards the outlet end with a clearance sufficient for thepassage of the wound tubular product, and the second circular elementsconstituting, together with the core, a working capacitor.

Such a design ensures a continuous operating process in which acontinuity is ensured by merely positioning each next batten on thehelical surface of the first circular element.

Now the invention will be described in detail by way of example withreference to the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general schematic viewpartly in elevation and partly in cross-section of the device formanufacturing tubular products from wooden battens according to theinvention;

FIG. 2 is a view taken along line II-II in FIG. 1;

FIG. 3 is a view in perspective of a circular element with a helicalface surface.

DETAILED DESCRIPTION OF THE INVENTION The device comprises a hollow core1 (FIG. 1) installed on a bed B, (illustrated diagrammatically in thedrawing) and rotated by an electric motor 2 via a transmission train 3.I

Fitting around the core are two circular elements 4 and 6 arranged oneafter the other in an axial direction The front circular element 4 (FIG.3) is rigidly fixed on the bed at the start-of-winding point and isprovided with a helical face surface 5. The pitch of the helical surfaceis approximately equal to the width of the wound batten which makes itpossible to wind the coils tightly to one another.

The second circular element 6 (FIG. 1) is installed after the element 4and is also mounted on the bed but it can rotate in synchronism with thecore 1. The element 6 is rotated by the electric motor 2 via thetransmission train 3.

The internal surface of the element 6 is tapered and narrows towards theoutlet end. The clearance between the element 6 and the core 1 issufficient for the passage of the wound product.

An endless driving band 10 tensioned on pulleys 7, 8 and 9 (FIG. 1, 2)at the point of location of the circular element 4 passes around theelement 4 and core 1 and presses a batten 11 against the core 1. Theband 10 is driven by a pulley 9 which is linked kinematically with thetransmission train 3. The transmission train is so designed as to drivethe band 10 and rotate the core 1 and the circular element 6 insynchronism.

The batten used for winding must be plasticized. And this can be done byan ammonia treatment, by steaming or by another method. One end of theplasticized batten 11 (FIGS. 1,2) is positioned on a flat surface 12.(FIG. 3) of the element 4.

During rotation of the core 1 and element 6 and during movement of theband 10, the band presses the batten 1 1 against the core 1.

A support 13 (FIG. 2). adjoining the flat surface 12 ensuresa continuouscontact between the batten and the core 1. Due to the helical shape ofthe face surface 5 of the element 4, the coils of the batten 11 arecontinuously displaced along the core 1. A tight closing of the coils toeach other is ensured since the pitch of the helical face surface 5 isequal to the width of the batten 4 being wound. In addition, the helicalface surface also compresses the coils. In order to fix the shape of theproduct more efficiently, there is a field of high frequency currentinduced between the core I and the circular element 6, with this fielddrying the tubular products.

- For feeding the high frequency currents, the core 1 is hollow andaccommodates an electric conductor. Whereby the core 1 and the element 6constitute a working capacitance, including the tubular product of woodtherebetween. A suitable power source having a frequency suitable forcausing sufficient current in the tubular product is connected betweenthe core 1 and the circular element 6. The details of such drying causedby circulating high frequency currents would be readily apparent tothose skilled in the art.

The internal tapered surface of the element 6 consists of two sectionswith different degrees of taper. The front section with relation to thestart-of-winding point has a larger angle of taper while the rearsection has a smaller angle of taper. This is required due to the natureof wood shrinkage. The tapered surface of the element 6 is calculated sothat after shrinkage, the batten is still pressed upon by the taperedsurface.

The battens can be fed onto the circular element 4 continuously.

We claim:

I. A device for manufacturing tubular products from wooden battenscomprising: a bed; a core rotatably installed on said bed; a firstcircular element fitting around said core and fixedly mounted on saidbed with relation to said core, said first circular element having ahelical face surface serving as a guide for the battens being wound onsaid core; an endless driving band mounted on the bed, said band fittingpartly around said first circular element and pressing said battensagainst said core; a second circular element fitting around said'core inspaced axial relationship to the first circular element, said secondcircular element being

1. A device for manufacturing tubular products from wooden battenscomprising: a bed; a core rotatably installed on said bed; a fIrstcircular element fitting around said core and fixedly mounted on saidbed with relation to said core, said first circular element having ahelical face surface serving as a guide for the battens being wound onsaid core; an endless driving band mounted on the bed, said band fittingpartly around said first circular element and pressing said battensagainst said core; a second circular element fitting around said core inspaced axial relationship to the first circular element, said secondcircular element being mounted on said bed for rotation in synchronismwith said core and said endless band; and said second circular elementhaving an outlet end, the second circular element having an internaltapered surface which narrows towards said outlet end to provide aclearance sufficient for the passage of the product wound on said core,the device including means for drying the formed tubular product.